Описание тега glyphicons
Glyphicons is a library of monochromatic icons available in raster image formats, vector image formats, and as fonts. A base subset of the library is included with Twitter Bootstrap.
Glyphicons is a library of monochromatic icons available in raster image formats, vector image formats, and as fonts. A base subset of the library is included with Twitter Bootstrap.
Traditionally images such as icons were placed on web pages via <img src="myimage.png /> tags. If a web page had hundreds of different images, there would be hundreds of requests from the web server to load them.
Glyphicons work differently. Hundreds of icons are on a single png file, then CSS will mask out a single icon. A typically Glyphicon will be shown on a page via <span class="glyphicon glyphicon-search"></span>. Because only a single png file was loaded, there is only one network request and all icons appear at once.